.footer-box {
    width: 100%;
    height: 50px;
    border-top: 1px solid #ccc;
    display: flex;
    flex-shrink: 0;
}

.footer-box a {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-box .active {
    color: red;
    background: skyblue;
}